Analytical Technology, Inc.’s direct-measuring, membraned polarographic sensor system has no moving parts, can be set up to measure either free or combined (chloramines) residual chlorine and can be provided with an optional pH sensor. Standard systems include a monitor mounted in a NEMA 4X enclosure with a large, dual-line LCD display indicating both residual chlorine and temperature or pH (optional). The monitor provides two 4-20 mA signals, two programmable alarm relays and a PID controller feature. Available for AC operation, portable battery operation or as a 24 VDC loop-powered instrument.www.analyticaltechnology.comsales@analyticaltechnology.com